For example:
https://cmake.org/cmake/help/v3.11/module/CMakeDependentOption.html vs https://cmake.org/cmake/help/v3.15/module/CMakeDependentOption.html
https://cmake.org/cmake/help/v3.11/module/CMakeAddFortranSubdirectory.html vs https://cmake.org/cmake/help/v3.15/module/CMakeAddFortranSubdirectory.html